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A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level comprises a cylinder including a bore therein and relief grooves formed symmetrically relatively to an axial center of the bore, while each of the relief grooves has a respective opening to an inner periphe

A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level comprises a cylinder including a bore therein and relief grooves formed symmetrically relatively to an axial center of the bore, while each of the relief grooves has a respective opening to an inner peripheral portion of the bore; a valve body disposed in the cylinder so as to be slidably moved in the bore in response to the discharged oil pressure supplied into the bore at one side of the valve body; a spring provided in the other side of the valve body constantly urging the valve body toward the one side of the valve body so as to close the openings of the relief grooves by the valve body; and an adjusting means for adjusting a change rate of an opening area of the relief grooves relatively to one slide movement of the valve body against the force of the spring so that the change rate of the opening area at the beginning of slide movement of the valve body is smaller than that at the end of the slide movement of the valve body.

대표청구항 ▼

A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level comprises a cylinder including a bore therein and relief grooves formed symmetrically relatively to an axial center of the bore, while each of the relief grooves has a respective opening to an inner periphe

A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level comprises a cylinder including a bore therein and relief grooves formed symmetrically relatively to an axial center of the bore, while each of the relief grooves has a respective opening to an inner peripheral portion of the bore; a valve body disposed in the cylinder so as to be slidably moved in the bore in response to the discharged oil pressure supplied into the bore at one side of the valve body; a spring provided in the other side of the valve body constantly urging the valve body toward the one side of the valve body so as to close the openings of the relief grooves by the valve body; and an adjusting means for adjusting a change rate of an opening area of the relief grooves relatively to one slide movement of the valve body against the force of the spring so that the change rate of the opening area at the beginning of slide movement of the valve body is smaller than that at the end of the slide movement of the valve body. iate part and then a second limb, in turn continuous with an outlet at a second free end; the flexible trap being capable, when used in an orientation wherein the inlet and the outlet are at a similar height and the intermediate part is below the inlet and below the outlet, of retaining a sufficient amount of the liquid within at least the intermediate part to allow operation as a plumbing trap by holding and allowing the passage of the liquid yet being capable of blocking the passage of a gas, the trap is made of a flexible material which is tubular and is selected from a range of flexible thermoplastic plastics materials including polyvinyl chloride; and the flexible material is effectively transparent yet coloured with an effective amount of a dye capable of absorbing light used by plant life, so that the growth of said plant life is discouraged. 2. The flexible trap as claimed in claim 1, characterised in that the flexible material is effectively transparent so that the contents of the trap may be inspected from the exterior. 3. The flexible trap as claimed in claim 1, characterised in that the flexible material is capable of being installed in a permanently distorted configuration so that connections may be made between misaligned pipes. 4. The flexible trap as claimed in claim 1, characterised in that a mechanical one-way valve is included within the flexible trap so that the trap function is retained even if insufficient liquid is present within the trap. 5. A flexible coupling, comprising the flexible trap as claimed in claim 1, for use in bridging a gap between a first conduit and a second conduit in situations where one conduit is capable of exhibiting motion in relation to the other, characterised in that both (a) the flexible material comprising the flexible coupling, and (b) the "alpha" (α) configuration which has the effect of distributing the strain over the entire loop serve to maintain the integrity of the coupling despite relative movement. 6. A method for the manufacture of preformed traps of a flexible hollow elongated material as claimed in claim 1, including the steps of: taking a suitable length of pipe, fitting a coil of wire within the pipe, softening the pipe using heat, placing the pipe in a jig in an over-bent shape to allow for some springing back, optionally returning it to the oven, cooling the pipe while holding the pipe in the jig, and removing the coil of wire by twisting one end so that the coil diameter is reduced and the coil can be withdrawn. 7. A method for the manufacture of preformed traps of a flexible hollow elongated material as claimed in claim 1, including the steps of: taking a length of pipe, placing a restriction at one end of the pipe, passing a flow of heated air through the pipe from the other end under a slight positive pressure capable of causing distension, and when the pipe is soft and able to be distorted, wrapping the pipe around a former of a suitable diameter and then continuing to pass now cooled gas through the pipe under a slight distending pressure until the pipe is no longer soft. 8. A flexible trap or coupling for connection between a conduit capable of delivering a liquid and a conduit capable of disposing of the liquid; the flexible trap comprising a tubular, flexible, elongate member in the form of an open loop having an inlet at a first free end, an intermediate loop, and an outlet at a second free end; the flexible trap being capable when in use and when the intermediate part is lower than the inlet and lower than the outlet of retaining a sufficient amount of the liquid within at least the intermediate part to be capable of functioning as a plumbing trap preventing the passage of a gas between the conduits, characterised in that the trap is made of a flexible material which is transparent and is coloured with an effective amount of a colouring agent capable of absorbing light of colours within the range of colours used by plant life, so that the growth of